Let's Play Legend of Grimrock 2 #23: The Obligatory Sewer Level
Is it really an RPG if there's not a sewer level of some kind? You might argue that Lands of Lore didn't have one, but I think the basement level of Castle Cimmeria fits the bill well enough. That aside, We need to traverse the sewers beneath Stormreach and surprising no-one, they're occupied by quite a few denizens that want us gone.
This floor is the home of a pretty difficult boss encounter but the peril is telegraphed so strongly that you'd have to be extremely unobservant to be caught off guard. Rest assured, the party will be exploring everywhere else they reasonably can before they take on that challenge and my, is there a lot of places to look around.
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